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Can not answer that ? yet! But, give me a week and I'll tell u. I am going to order a fmfpower bomb head pipe and a pc 4 ti can this morning from rocky mountain atv. I know this does not answer your ? but, I think a pipe would be a nice addition for more throttle response and weight savings.

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Aftermarket exhaust or the stock kx exhaust is a HUGE improvement on our bikes. I am running a power bomb header and Q4 silencer and I absolutley love the power increase. I have heard a lot of guys like the stock kx exhaust and you can pick it up cheap on ebay or in the classified section. I would definatly recommend changing the exhaust. You won't regret it.

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I just put a new pc 4 ti pipe and fmfpower bomb head pipe on mine and jetted with a jd mj 160 or 165(can'nt remember). Alot better bike running wise. Pulls good all through the band, chugs better down low also and pulls the tire off the ground with ease. Just what the Dr ordered!

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I ran a Yoshimura silencer for about a year and then switched to a full (used) KXF system, which definitely makes the bike feel stronger. I lost a bit off the bottom, but really you don't notice it after a few hours. Unless you're RC out there wringing the guts out of it, its really hard to NEED more power out a 450. a 450 in most cases is more than a good rider can use. I am definitely in that category. All of my performance oriented mods have been done in order to get the bike to run cool and not blow coolant everywhere. Oh, and so my gas doesn't boil. Thanks Kawasaki!

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I installed a full FMF system, installed a JD jetting kit, cut the airbox, and removed the AIS all in one shot, and the results were pretty remarkable. I'm certain the FMF system was a big part of equation, and well worth the cash outlay.